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3 years ago

Someone please help this is due tomorrow;(

Mathematics

1 answer:

nevsk [136]3 years ago

7 0

Sorry if my handwriting sloppy.

I showed all of it step by step.

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What is sn for the arithmetic series with a1=3 an=-38 and n=8?

otez555 [7]

Sn = n/2 (a1+an)
= 8/2 (3-38)
= 4 (-35)
= -140

4 0

3 years ago

The gcf of two numbers less than or equal to 12 is 2. Their LCM is 20.What are the numbers?

bixtya [17]

We know:

$LCM(a,\ b)=\dfrac{ab}{GCF(a,\ b)}$

We have

$GCF(a,\ b)=2,\ LCM(a,\ b)=20,\ a\leq12,\ b\leq12$

Substitute:

$20=\dfrac{ab}{2}\qquad|\cdot2\\\\ab=40$

$40=1\cdot40=2\cdot20=4\cdot10=5\cdot8$

Only 4 and 10 meet the requirements of the question.

--------------------------------------------------------------------

40 and 1 NOT, because 40 > 12

20 and 2 NOT, because 20 > 12

5 and 8 NOT because GCF(5, 8) = 1

5 0

2 years ago

12-2/3x=x-18 so how do you answer this question

vitfil [10]

Answer:

Step-by-step explanation:

I think I've already answered this question.

3 0

2 years ago

4) 8(-2 + 2n) + 3n = 40 +5n

Nikitich [7]

Answer:

use the distributive property to distribute the 8

-16+16n+3n=40+5n

-16+19n=40+5n

-16=40+5n-19n

-16=40-14n

-14n+40= -16

-14n= -16-40

-14n= -56

n= -56/-14

n= 4

5 0

2 years ago

Read 2 more answers

Evaluate 12x−3y12x−3y when x=−14x=−14 and y=3y=3.

Harrizon [31]

Well the first problem that i solve is you have to move 12 it will give you
-3y power 12 - 3y + 12

6 0

3 years ago